Condition − Condition variables to synchronize between threads.
: sig end
Condition variables to synchronize between threads.
variables are used when one thread wants to wait until
another thread has finished doing something: the former
thread ’waits’ on the condition variable, the
latter thread ’signals’ the condition when it is
done. Condition variables should always be protected by a
mutex. The typical use is (if D is a shared data
structure, m its mutex, and c is a condition
while (* some predicate P over D is not satisfied *) do
Condition.wait c m
(* Modify D *)
if (* the predicate P over D is now satisfied *) then Condition.signal c;
The type of condition variables.
val create : unit -> t
Return a new condition variable.
val wait : t -> Mutex.t -> unit
wait c m atomically unlocks the mutex m and suspends the calling process on the condition variable c . The process will restart after the condition variable c has been signalled. The mutex m is locked again before wait returns.
val signal : t -> unit
signal c restarts one of the processes waiting on the condition variable c .
val broadcast : t -> unit
broadcast c restarts all processes waiting on the condition variable c .